基于微纳粉的铝合金薄板激光焊接接头的组织与性能  

Microstructure and Properties of Aluminum Alloy Sheet Laser Welded Joints Based on Micro Nano Powder

作　　者：晁栓 王宏宇[1] 丁瑞[1] 黄爱国[1] 吴志奎[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《热加工工艺》2016年第9期55-58,62,共5页Hot Working Technology

基　　金：江苏省精密与微细制造重点实验室开放基金项目(KFA11250-04);江苏省光子制造科学与技术重点实验室开放基金项目(GZ201203);国家自然科学基金项目(51372216)

摘　　要：采用YAG固体脉冲激光器对基于微纳复合粉体的铝合金薄板进行两面激光焊接试验。利用金相显微镜、扫描电子显微镜、万能试验机和显微硬度机等仪器分析了焊接接头的显微组织、拉伸性能和硬度分布。结果发现:添加纳米氧化铈的熔合区组织较未添加纳米颗粒时更加均匀,显微硬度也略有提高(约为115-125HV);纳米碳化硅的添加可打断枝晶区的生长连续性,熔合区显微硬度明显提高(最高值达135HV),但波动较大。添加纳米氧化铈和纳米碳化硅颗粒后,焊接试样拉伸强度分别达到母材的93.24%、95.5%,可见在相同工艺条件下,尽管由于激光吸收率的提高会加大母材软化现象,但并未对试样拉伸强度产生不利影响。Both sides welding on aluminum alloy sheet based on micro nano composite powder was carried out by YAG solid pulse lasers. The microstructure, tensile property and hardness distribution of the welded joints were analyzed by optical microscope, scanning electron microscope（SEM）, universal testing machine and microhardness tester. The results show that the microstructure with addition of nano cerium oxide in the fusion zone is more uniform than that of without adding nanoparticles.The microhardness also increases slightly（about 115-125HV）. The addition of nano SiC addition could interrupt the growth continuity of dendrite area. The microhardness in fusion zone increases significantly（the maximum value of 135HV）, but fluctuation is larger. After adding nano cerium oxide and nano SiC particles, the tensile strength of the welding sample is 93.24%, 95.5% of base metal, respectively. Under the same conditions, due to the increase of laser absorption power, the parent material softening phenomenon becomes obvious, but it has no bad effect on the tensile strength of the samples.

关 键 词：微纳复合粉体 激光焊接 显微组织 硬度分布 拉伸性能 

分 类 号：TG457[金属学及工艺—焊接]